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When the Deltoid contracts the humerus abducts.
Points The toes
Quads
Internal rotation of the shoulder
Flexion
When you Bend your Leg your hamstring contracts and your quadriceps relax
When the bicep contracts the triceps relax
right
It contracts.
The flexor would be the hamstring, and gastrocnemius, which bend/flex the knee. The quadriceps, are extensors, which straighten/extend the knee.
It depends on the severity of the injury and the location. A tear in the muscle or tendon is called a strain.
It contracts